Authors:Pankaj Kumar Singh, Swapnil Kushwaha, Kishan Bhusan SahayPages: 1 - 7Abstract: : Owing to low cost and system compactness, transformerless inverters became popular in single-phase grid connected photovoltaic (PV) systems. Improvement of conversion efficiency, reduction in distortion of the grid current and minimizing common mode leakage current are the major concerns in these inverters. The purpose of this paper is to review on various transformerless solar PV inverters. In this paper, the single-phase inverters are classified into two major categories: 1) Nonpatent Survey and 2) Patent Survey. These two categories are further divided in various subcategories. Each subcategories are elaborated and their merits and demerits are discussed. This paper provides in depth analysis of several single phase solar PV inverters. Thus, it can be taken as reference for researchers.

Authors:Dhananjay Gupta, Santosh Kumar Suman, Awadhesh KumarPages: 8 - 14Abstract: : This paper presents the stabilization and trajectory tracking of magnetic levitation system using optimal control technique. The magnetic levitation (Maglev) system is exceedingly unstable and nonlinear system. The magnetic levitation has been a desirous area of exploration for utilization, especially in the scope of automotive where low losses due to friction and low energy consumption are an important idea. The (Maglev) system has become a large effective technology in the intensity of the mass transportation system due to its frictionless motion. Its controller design is a challenging problem. The design process of optimal control law for large scale systems is very difficult due to main demerits of optimal control principle which demands feedback from completely state variables that are demonstrated to depict the dynamics of the system (Maglev). Balance truncation method for model order reduction is used for reaching at the controller parameters; the MOR technique offers a stage to a simple understanding of the main system. It also supply a simpler dynamic for simple treatment and control characteristic. The simulation results are presented to compare the effectiveness of the controller in terms of their ability to respond to step inputs by the proposed optimal control method.

Authors:Krushnakant Kolaiprasad kori, Maulik Panchal, Mohan M. Khambalkar, Mehfuza S. HoliyaPages: 15 - 19Abstract: : As fast growth in population, the problem of parking space is surplus as no. of car increases. Because of limited parking space, people have to wait in the queue to get their car parked. Parallel parking in narrow spaces is often the most tedious and annoying task for drivers. The situation becomes even harder when visibility behind the vehicle decreased because of the aerodynamic shape of a car. To overcome this problem, we present an effective, simple and reliable solution to implement low-cost self-parking car. In this prototype, we have used hardware like Nodemcu, ultrasonic sensor, and an infrared sensor. The car is planned to be made smarter by using image processing and more effective sensors like Lidar. Results of the prototype show how self-parking can be implemented in regular cars and abundant time and space can be saved.

Authors:Neeharika Bakhla, Priya Laxmi, Pranabendu GangopadhyayPages: 20 - 26Abstract: : Optical integrated circuits analogous to electronic integration have many advantages over the latter technology. As information carriers are photons (bosons) in optical circuits rather than electrons (fermions), which maximize the speed as well as due to minimum mutual interaction between photons, losses are reduced whereas the band-width increases. Silicon is most dominant material in fabrication of Electronic Integrated Circits (EICs), Photonic Integrated Circuits (PICs) exploits the suitable optical properties of certain polymers as well. This report comprises of the experimental work undertaken on an optical waveguides along with the relevant theoretical studies. Experimental work basically covers the study of SU-8 polymer as an optical waveguide, its characterization using monochromatic and white light sources and fabrication methods. It is also intended to experimentally study the effect of fluorination on SU-8 waveguides.

Authors:Sumit Kumar Singh, Ashok Kumar Pandey, Anjani Kumar PrajapatiPages: 27 - 33Abstract: : This paper deals with performance analysis bridgeless converter based switched mode power supply (SMPS) of improved power quality. Power Factor Correction (PFC) based bridge less SMPS having so many applications in the area of welding power supply with IPC. This topology based on the constant voltage output and output current varied according to load changes. In the proposed topology, it is replaced the front end diode bridge rectifier with single ended primary inductance converter (SEPIC) based SMPS used for arc welding application. Conventional diode bridge converter based SMPS gives high distortion in supply current and hence lower power factor. To remove this power quality problem of without bridge buck-boost one phase single ended primary inductance converter based SMPS proposed. Due to the absence of diode bridge in input side and availability of two switches enhance the power quality. The operation involved here is discontinuous conduction mode. Bridgeless SEPIC-converter based SMPS operates with single-phase ac supply. Proposed connection worked in conduction mode of discontinuous which results in improved power factor. The analysis and performance of bridgeless SEPIC type SMPS based rectifier is done under the 220-Vrms input supply voltage and 120-Watt resistive load. The result is analyzed by simulating the proposed circuit in MATLAB/Simulink.